mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 165
mc9s12e256
Manufacturer Part Number
mc9s12e256
Description
Hcs12 Microcontrollers 16-bit Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12E256.pdf
(602 pages)
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Chapter 4
Clocks and Reset Generator (CRGV4)
4.1
This specification describes the function of the clocks and reset generator (CRGV4).
4.1.1
The main features of this block are:
Freescale Semiconductor
•
•
•
•
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Phase-locked loop (PLL) frequency multiplier
— Reference divider
— Automatic bandwidth control mode for low-jitter operation
— Automatic frequency lock detector
— CPU interrupt on entry or exit from locked condition
— Self-clock mode in absence of reference clock
System clock generator
— Clock quality check
— Clock switch for either oscillator- or PLL-based system clocks
— User selectable disabling of clocks during wait mode for reduced power consumption
Computer operating properly (COP) watchdog timer with time-out clear window
System reset generation from the following possible sources:
— Power-on reset
— Low voltage reset
— COP reset
— Loss of clock reset
— External pin reset
Real-time interrupt (RTI)
Introduction
Refer to the device overview section for availability of this feature.
Features
MC9S12E256 Data Sheet, Rev. 1.08
165
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